<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Sample</title>
<meta name="viewport"
            content="width=device-width, initial-scale=1.0">
<meta name="HandheldFriendly" content="true">
</head>
<body>
<canvas id="myCanvas" width="300" height="150"
        style="border:1px dashed #c3c3c3;">
   这里放置的内容用于浏览器不支持Canvas的情况
</canvas>
<script>
var canvas = document.getElementById("myCanvas");
if (canvas && canvas.getContext) {
   var cxt = canvas.getContext("2d");
   cxt.shadowOffsetX = 5;
   cxt.shadowOffsetY = 5;
   cxt.shadowBlur     = 4;
   cxt.shadowColor    = 'rgba(0, 0, 0, 0.5)';
   cxt.fillStyle = "#FF0000";
   cxt.fillRect(50,30,150,75);
}
</script>
</body>
</html>
